<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var a1 = prompt('输入你的姓名');
      if (a1 == '刘德华') {
        alert('恭喜你中了5块钱');
      } else {
        alert('你没有中奖');
      }
    </script>
  </body>
</html>
